No, I got it to work with single CPU.
Take the lid off and watch the post process, it'll go through 3 phases, just pay attention to the last number that comes up. Also watch the LEDs by CPU 1, there's a catastrophic error led that'll light at some point if the CPU is hosed
Thanks and @RolloZ170 , you nailed it...don't populate memory in CPU2 slots.
That's what happens when let an 5yo and 10yo kids play with your toys... They don't like how inserting ram hurts their fingers. However, they like that "click" and wanted to keep going. Lol.